Dear Paulo,

I have a question: I can use iText to encrypt a pdf file (change permission). 
For example, I can make an pdf file not printable and set owner password, and 
later I can use the owner password to change the permission to make it 
printable 
again. But, the problem is if I make a pdf file not printable without setting 
owner password (password is null), later I cannot change it back (make it 
printable again) and always get error message: "reader was not opened with 
owner 
password", but I did not set owner password and there is no owner password. How 
do I solve this problem? 


Thanks.

Best Regards,
Sam

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